An aphrodisiac is a food, drug, potion, or other agent that arouses sexual desire. Yohimbine is the main alkaloid of Yohimbe. Its main action is as an alpha-adrenergic antagonist, by which yohimbine may increase genital blood flow and both sexual sensitivity and excitation in some people. Preparations of yohimbe bark are available over-the-counter and should be used with caution. The unrefined yohimbe bark contains several active alkaloids besides yohimbine. Side effects might include rapid pulse, sweating, and anxiety.
There is a chemical in chocolate called phenylethylamine, and there have been some discussion as to whether it is an aphrodisiac. There is very brief evidence to support the theory that phenethylamine released in the brain may be involved in sexual attraction and arousal. Although this compound is quickly debauched by the enzyme MAO, so it is unlikely that any large amounts would reach the brain.
